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NE40E V800R010C10SPC500 Feature Description - Network Reliability 01

This is NE40E V800R010C10SPC500 Feature Description - Network Reliability
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Association Between VRRP and a VRRP-disabled Interface

Association Between VRRP and a VRRP-disabled Interface

Background

Virtual Router Redundancy Protocol (VRRP) can monitor the status change only in the VRRP-enabled interface on the master device. If a VRRP-disabled interface on the master device or the uplink connecting the interface to a network fails, VRRP cannot detect the fault, which causes traffic interruptions.

To resolve this issue, configure VRRP to monitor the VRRP-disabled interface status. If a VRRP-disabled interface on the master device or the uplink connecting the interface to a network fails, VRRP instructs the master device to reduce its priority to trigger a master/backup VRRP switchover.

Related Concepts

If a VRRP-disabled interface of a VRRP device goes Down, the VRRP device changes its VRRP priority in either of the following modes:
  • Increased mode: The VRRP device increases its VRRP priority by a specified value.
  • Reduced mode: The VRRP device reduces its VRRP priority by a specified value.

Implementation

As shown in Figure 5-13, a VRRP backup group is configured on Device A and Device B. Device A is the master device, and Device B is the backup device.

Device A is configured to monitor interface 1. If interface 1 fails, Device A reduces its VRRP priority and sends a VRRP Advertisement packet carrying a reduced priority. After Device B receives the packet, it checks that its VRRP priority is higher than the received priority and preempts the Master state.

After interface 1 goes Up, Device A restores the VRRP priority. After Device A receives a VRRP Advertisement packet carrying Device B's priority in preemption mode, Device A checks that its VRRP priority is higher than the received priority and preempts the Master state.

Figure 5-13 Association between VRRP and a VRRP-disabled interface

Benefits

The association between VRRP and a VRRP-disabled interface helps trigger a master/backup VRRP switchover if the VRRP-disabled interface fails or the uplink connecting the interface to a network fails.

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Updated: 2019-01-03

Document ID: EDOC1100055045

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